The 68-year-old retired talk show host did one of his famous top 10 lists to slam Donald, who has been riddled with controversy in the recent past.

“I retired and… I had no regrets. None. I was happy. I’ll make actual friends. I was complacent, I was satisfied, I was content. And then a couple of days ago, Donald Trump said he was running for president,” David told the crowd. “I have made the biggest mistake of my life, I tell you.”

David Letterman Comes Out of Retirement for a Donald Trump Top 10 List

Click inside to read David Letterman’s full Top 10 List about Donald Trump…More Here! »

“I definitely love racing. I love the camaraderie and the fellowship. I think the challenge is with oneself and not so much your fellow competitors, necessarily,” Patrick shared to People at the race, where he had the privilege of waving the green flag.